Arrival Rates

Arrival rates are defined as the rate at which portal users (employees/customers) login over a period of time. Arrival rates with steep peaks can cause Portal Server to became CPU-bound even if at other times throughout the day CPU utilization is minimal. Consider the example where, employees and/or customers of an enterprise start connecting to the portal early in the morning, remain mostly idle for rest of day and either logout due to session time out or manually logout at end of business. This is the most common scenario for business to employee portals and for some outward-facing portals with high locality of their user base. The rate at which the users login in the morning or logout at the end of day and perform any interaction with the portal server, determines the throughput demanded from the portal server. The throughput test gives a reliable conclusion for this requirement.